Expression of the cholinergic signal-transduction pathway components during embryonic rat heart development

The Anatomical Record
D FrancoW H Lamers

Abstract

Previous studies showed that acetylcholinesterase (AChE) activity is present in the downstream (arterial) part of the embryonic chick and rat heart, but its functional significance was unclear. To establish whether other components of a cholinergic signal-transduction pathway are present in the embryonic heart, we localised the mRNAs encoding choline acetyltransferase (ChAT), acetylcholinesterase (AChE), and the muscarinic receptor isoforms (mAChRs; m1-m5). Messenger RNA detection and localisation by in situ hybridisation and reverse transcriptase-polymerase chain reaction were employed. Expression of ChAT and AChE mRNAs was observed from 15 embryonic days onward in the neural tissue covering the dorsocranial wall of the atria. Muscarinic receptors (m1, m2, m4) were observed at the same localisation as AChE and ChAT mRNAs, both during embryogenesis and after birth. In addition, m1 and m4 mAChRs showed a low level of expression in the atrial myocardium during the fetal period. No expression of the m3 or the m5 mAChRs was observed in or near the embryonic hearts. ChAT, AChE, and mAChRs (m1, m2, m4) mRNAs always colocalised in the cardiac ganglia. However, none of these mRNAs was found at a detectable level in the outflow tract an...Continue Reading

References

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Related Concepts

Embryo
Establishment and Maintenance of Localization
Embryonic Heart
Study
Biochemical Pathway
Entire Cardiac Ganglia
Ache
ACHE
CYP2C19*6 Allele
Signal Transduction Pathways

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